1 /* gspawn.c - Process launching
3 * Copyright 2000 Red Hat, Inc.
4 * g_execvpe implementation based on GNU libc execvp:
5 * Copyright 1991, 92, 95, 96, 97, 98, 99 Free Software Foundation, Inc.
7 * GLib is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
12 * GLib is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with GLib; see the file COPYING.LIB. If not, write
19 * to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
26 #include <sys/types.h>
34 #ifdef HAVE_SYS_SELECT_H
35 #include <sys/select.h>
36 #endif /* HAVE_SYS_SELECT_H */
42 static gint g_execute (const gchar *file,
45 gboolean search_path);
47 static gboolean make_pipe (gint p[2],
49 static gboolean fork_exec_with_pipes (gboolean intermediate_child,
50 const gchar *working_directory,
53 gboolean close_descriptors,
55 gboolean stdout_to_null,
56 gboolean stderr_to_null,
57 gboolean child_inherits_stdin,
58 gboolean file_and_argv_zero,
59 GSpawnChildSetupFunc child_setup,
63 gint *standard_output,
68 g_spawn_error_quark (void)
70 return g_quark_from_static_string ("g-exec-error-quark");
75 * @working_directory: child's current working directory, or %NULL to inherit parent's
76 * @argv: child's argument vector
77 * @envp: child's environment, or %NULL to inherit parent's
78 * @flags: flags from #GSpawnFlags
79 * @child_setup: function to run in the child just before exec()
80 * @user_data: user data for @child_setup
81 * @child_pid: return location for child process ID, or %NULL
82 * @error: return location for error
84 * See g_spawn_async_with_pipes() for a full description; this function
85 * simply calls the g_spawn_async_with_pipes() without any pipes.
87 * Return value: %TRUE on success, %FALSE if error is set
90 g_spawn_async (const gchar *working_directory,
94 GSpawnChildSetupFunc child_setup,
99 g_return_val_if_fail (argv != NULL, FALSE);
101 return g_spawn_async_with_pipes (working_directory,
111 /* Avoids a danger in threaded situations (calling close()
112 * on a file descriptor twice, and another thread has
113 * re-opened it since the first close)
116 close_and_invalidate (gint *fd)
133 READ_FAILED = 0, /* FALSE */
139 read_data (GString *str,
148 bytes = read (fd, buf, 4096);
154 g_string_append_len (str, buf, bytes);
157 else if (bytes < 0 && errno == EINTR)
164 _("Failed to read data from child process (%s)"),
175 * @working_directory: child's current working directory, or %NULL to inherit parent's
176 * @argv: child's argument vector
177 * @envp: child's environment, or %NULL to inherit parent's
178 * @flags: flags from #GSpawnFlags
179 * @child_setup: function to run in the child just before exec()
180 * @user_data: user data for @child_setup
181 * @standard_output: return location for child output
182 * @standard_error: return location for child error messages
183 * @exit_status: return location for child exit status, as returned by waitpid()
184 * @error: return location for error
186 * Executes a child synchronously (waits for the child to exit before returning).
187 * All output from the child is stored in @standard_output and @standard_error,
188 * if those parameters are non-%NULL. If @exit_status is non-%NULL, the exit
189 * status of the child is stored there as it would be returned by
190 * waitpid(); standard UNIX macros such as WIFEXITED() and WEXITSTATUS()
191 * must be used to evaluate the exit status. If an error occurs, no data is
192 * returned in @standard_output, @standard_error, or @exit_status.
194 * This function calls g_spawn_async_with_pipes() internally; see that
195 * function for full details on the other parameters and details on
196 * how these functions work on Windows.
198 * Return value: %TRUE on success, %FALSE if an error was set.
201 g_spawn_sync (const gchar *working_directory,
205 GSpawnChildSetupFunc child_setup,
207 gchar **standard_output,
208 gchar **standard_error,
217 GString *outstr = NULL;
218 GString *errstr = NULL;
222 g_return_val_if_fail (argv != NULL, FALSE);
223 g_return_val_if_fail (!(flags & G_SPAWN_DO_NOT_REAP_CHILD), FALSE);
224 g_return_val_if_fail (standard_output == NULL ||
225 !(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE);
226 g_return_val_if_fail (standard_error == NULL ||
227 !(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE);
229 /* Just to ensure segfaults if callers try to use
230 * these when an error is reported.
233 *standard_output = NULL;
236 *standard_error = NULL;
238 if (!fork_exec_with_pipes (FALSE,
242 !(flags & G_SPAWN_LEAVE_DESCRIPTORS_OPEN),
243 (flags & G_SPAWN_SEARCH_PATH) != 0,
244 (flags & G_SPAWN_STDOUT_TO_DEV_NULL) != 0,
245 (flags & G_SPAWN_STDERR_TO_DEV_NULL) != 0,
246 (flags & G_SPAWN_CHILD_INHERITS_STDIN) != 0,
247 (flags & G_SPAWN_FILE_AND_ARGV_ZERO) != 0,
252 standard_output ? &outpipe : NULL,
253 standard_error ? &errpipe : NULL,
257 /* Read data from child. */
263 outstr = g_string_new (NULL);
268 errstr = g_string_new (NULL);
271 /* Read data until we get EOF on both pipes. */
280 FD_SET (outpipe, &fds);
282 FD_SET (errpipe, &fds);
284 ret = select (MAX (outpipe, errpipe) + 1,
287 NULL /* no timeout */);
289 if (ret < 0 && errno != EINTR)
296 _("Unexpected error in select() reading data from a child process (%s)"),
302 if (outpipe >= 0 && FD_ISSET (outpipe, &fds))
304 switch (read_data (outstr, outpipe, error))
310 close_and_invalidate (&outpipe);
321 if (errpipe >= 0 && FD_ISSET (errpipe, &fds))
323 switch (read_data (errstr, errpipe, error))
329 close_and_invalidate (&errpipe);
341 /* These should only be open still if we had an error. */
344 close_and_invalidate (&outpipe);
346 close_and_invalidate (&errpipe);
348 /* Wait for child to exit, even if we have
353 ret = waitpid (pid, &status, 0);
359 else if (errno == ECHILD)
363 g_warning ("In call to g_spawn_sync(), exit status of a child process was requested but SIGCHLD action was set to SIG_IGN and ECHILD was received by waitpid(), so exit status can't be returned. This is a bug in the program calling g_spawn_sync(); either don't request the exit status, or don't set the SIGCHLD action.");
367 /* We don't need the exit status. */
372 if (!failed) /* avoid error pileups */
379 _("Unexpected error in waitpid() (%s)"),
388 g_string_free (outstr, TRUE);
390 g_string_free (errstr, TRUE);
397 *exit_status = status;
400 *standard_output = g_string_free (outstr, FALSE);
403 *standard_error = g_string_free (errstr, FALSE);
410 * g_spawn_async_with_pipes:
411 * @working_directory: child's current working directory, or %NULL to inherit parent's, in the GLib file name encoding
412 * @argv: child's argument vector, in the GLib file name encoding
413 * @envp: child's environment, or %NULL to inherit parent's, in the GLib file name encoding
414 * @flags: flags from #GSpawnFlags
415 * @child_setup: function to run in the child just before exec()
416 * @user_data: user data for @child_setup
417 * @child_pid: return location for child process ID, or %NULL
418 * @standard_input: return location for file descriptor to write to child's stdin, or %NULL
419 * @standard_output: return location for file descriptor to read child's stdout, or %NULL
420 * @standard_error: return location for file descriptor to read child's stderr, or %NULL
421 * @error: return location for error
423 * Executes a child program asynchronously (your program will not
424 * block waiting for the child to exit). The child program is
425 * specified by the only argument that must be provided, @argv. @argv
426 * should be a %NULL-terminated array of strings, to be passed as the
427 * argument vector for the child. The first string in @argv is of
428 * course the name of the program to execute. By default, the name of
429 * the program must be a full path; the <envar>PATH</envar> shell variable
430 * will only be searched if you pass the %G_SPAWN_SEARCH_PATH flag.
432 * On Windows, note that all the string or string vector arguments to
433 * this function and the other g_spawn*() functions are in UTF-8, the
434 * GLib file name encoding. Unicode characters that are not part of
435 * the system codepage passed in argument vectors will be correctly
436 * available in the spawned program only if it uses wide character API
437 * to retrieve its command line. For C programs built with Microsoft's
438 * tools it is enough to make the program have a wmain() instead of
439 * main(). wmain() has a wide character argument vector as parameter.
441 * At least currently, mingw doesn't support wmain(), so if you use
442 * mingw to develop the spawned program, it will have to call the
443 * undocumented function __wgetmainargs() to get the wide character
444 * argument vector and environment. See gspawn-win32-helper.c in the
445 * GLib sources or init.c in the mingw runtime sources for a prototype
446 * for that function. Alternatively, you can retrieve the Win32 system
447 * level wide character command line passed to the spawned program
448 * using the GetCommandLineW() function.
450 * On Windows the low-level child process creation API
451 * <function>CreateProcess()</function> doesn't use argument vectors,
452 * but a command line. The C runtime library's
453 * <function>spawn*()</function> family of functions (which
454 * g_spawn_async_with_pipes() eventually calls) paste the argument
455 * vector elements together into a command line, and the C runtime startup code
456 * does a corresponding reconstruction of an argument vector from the
457 * command line, to be passed to main(). Complications arise when you have
458 * argument vector elements that contain spaces of double quotes. The
459 * <function>spawn*()</function> functions don't do any quoting or
460 * escaping, but on the other hand the startup code does do unquoting
461 * and unescaping in order to enable receiving arguments with embedded
462 * spaces or double quotes. To work around this asymmetry,
463 * g_spawn_async_with_pipes() will do quoting and escaping on argument
464 * vector elements that need it before calling the C runtime
467 * @envp is a %NULL-terminated array of strings, where each string
468 * has the form <literal>KEY=VALUE</literal>. This will become
469 * the child's environment. If @envp is %NULL, the child inherits its
470 * parent's environment.
472 * @flags should be the bitwise OR of any flags you want to affect the
473 * function's behaviour. The %G_SPAWN_DO_NOT_REAP_CHILD means that
474 * the child will not automatically be reaped; you must use a
475 * #GChildWatch source to be notified about the death of the child
476 * process. Eventually you must call g_spawn_close_pid() on the
477 * @child_pid, in order to free resources which may be associated
478 * with the child process. (On Unix, using a #GChildWatch source is
479 * equivalent to calling waitpid() or handling the %SIGCHLD signal
480 * manually. On Windows, calling g_spawn_close_pid() is equivalent
481 * to calling CloseHandle() on the process handle returned in
484 * %G_SPAWN_LEAVE_DESCRIPTORS_OPEN means that the parent's open file
485 * descriptors will be inherited by the child; otherwise all
486 * descriptors except stdin/stdout/stderr will be closed before
487 * calling exec() in the child. %G_SPAWN_SEARCH_PATH
488 * means that <literal>argv[0]</literal> need not be an absolute path, it
489 * will be looked for in the user's <envar>PATH</envar>.
490 * %G_SPAWN_STDOUT_TO_DEV_NULL means that the child's standard output will
491 * be discarded, instead of going to the same location as the parent's
492 * standard output. If you use this flag, @standard_output must be %NULL.
493 * %G_SPAWN_STDERR_TO_DEV_NULL means that the child's standard error
494 * will be discarded, instead of going to the same location as the parent's
495 * standard error. If you use this flag, @standard_error must be %NULL.
496 * %G_SPAWN_CHILD_INHERITS_STDIN means that the child will inherit the parent's
497 * standard input (by default, the child's standard input is attached to
498 * /dev/null). If you use this flag, @standard_input must be %NULL.
499 * %G_SPAWN_FILE_AND_ARGV_ZERO means that the first element of @argv is
500 * the file to execute, while the remaining elements are the
501 * actual argument vector to pass to the file. Normally
502 * g_spawn_async_with_pipes() uses @argv[0] as the file to execute, and
503 * passes all of @argv to the child.
505 * @child_setup and @user_data are a function and user data. On POSIX
506 * platforms, the function is called in the child after GLib has
507 * performed all the setup it plans to perform (including creating
508 * pipes, closing file descriptors, etc.) but before calling
509 * exec(). That is, @child_setup is called just
510 * before calling exec() in the child. Obviously
511 * actions taken in this function will only affect the child, not the
512 * parent. On Windows, there is no separate fork() and exec()
513 * functionality. Child processes are created and run with
514 * a single API call, CreateProcess(). @child_setup is
515 * called in the parent process just before creating the child
516 * process. You should carefully consider what you do in @child_setup
517 * if you intend your software to be portable to Windows.
519 * If non-%NULL, @child_pid will on Unix be filled with the child's
520 * process ID. You can use the process ID to send signals to the
521 * child, or to waitpid() if you specified the
522 * %G_SPAWN_DO_NOT_REAP_CHILD flag. On Windows, @child_pid will be
523 * filled with a handle to the child process only if you specified the
524 * %G_SPAWN_DO_NOT_REAP_CHILD flag. You can then access the child
525 * process using the Win32 API, for example wait for its termination
526 * with the <function>WaitFor*()</function> functions, or examine its
527 * exit code with GetExitCodeProcess(). You should close the handle
528 * with CloseHandle() or g_spawn_close_pid() when you no longer need it.
530 * If non-%NULL, the @standard_input, @standard_output, @standard_error
531 * locations will be filled with file descriptors for writing to the child's
532 * standard input or reading from its standard output or standard error.
533 * The caller of g_spawn_async_with_pipes() must close these file descriptors
534 * when they are no longer in use. If these parameters are %NULL, the corresponding
535 * pipe won't be created.
537 * If @standard_input is NULL, the child's standard input is attached to /dev/null
538 * unless %G_SPAWN_CHILD_INHERITS_STDIN is set.
540 * If @standard_error is NULL, the child's standard error goes to the same location
541 * as the parent's standard error unless %G_SPAWN_STDERR_TO_DEV_NULL is set.
543 * If @standard_output is NULL, the child's standard output goes to the same location
544 * as the parent's standard output unless %G_SPAWN_STDOUT_TO_DEV_NULL is set.
546 * @error can be %NULL to ignore errors, or non-%NULL to report errors.
547 * If an error is set, the function returns %FALSE. Errors
548 * are reported even if they occur in the child (for example if the
549 * executable in <literal>argv[0]</literal> is not found). Typically
550 * the <literal>message</literal> field of returned errors should be displayed
551 * to users. Possible errors are those from the #G_SPAWN_ERROR domain.
553 * If an error occurs, @child_pid, @standard_input, @standard_output,
554 * and @standard_error will not be filled with valid values.
556 * If @child_pid is not %NULL and an error does not occur then the returned
557 * pid must be closed using g_spawn_close_pid().
559 * Return value: %TRUE on success, %FALSE if an error was set
562 g_spawn_async_with_pipes (const gchar *working_directory,
566 GSpawnChildSetupFunc child_setup,
569 gint *standard_input,
570 gint *standard_output,
571 gint *standard_error,
574 g_return_val_if_fail (argv != NULL, FALSE);
575 g_return_val_if_fail (standard_output == NULL ||
576 !(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE);
577 g_return_val_if_fail (standard_error == NULL ||
578 !(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE);
579 /* can't inherit stdin if we have an input pipe. */
580 g_return_val_if_fail (standard_input == NULL ||
581 !(flags & G_SPAWN_CHILD_INHERITS_STDIN), FALSE);
583 return fork_exec_with_pipes (!(flags & G_SPAWN_DO_NOT_REAP_CHILD),
587 !(flags & G_SPAWN_LEAVE_DESCRIPTORS_OPEN),
588 (flags & G_SPAWN_SEARCH_PATH) != 0,
589 (flags & G_SPAWN_STDOUT_TO_DEV_NULL) != 0,
590 (flags & G_SPAWN_STDERR_TO_DEV_NULL) != 0,
591 (flags & G_SPAWN_CHILD_INHERITS_STDIN) != 0,
592 (flags & G_SPAWN_FILE_AND_ARGV_ZERO) != 0,
603 * g_spawn_command_line_sync:
604 * @command_line: a command line
605 * @standard_output: return location for child output
606 * @standard_error: return location for child errors
607 * @exit_status: return location for child exit status, as returned by waitpid()
608 * @error: return location for errors
610 * A simple version of g_spawn_sync() with little-used parameters
611 * removed, taking a command line instead of an argument vector. See
612 * g_spawn_sync() for full details. @command_line will be parsed by
613 * g_shell_parse_argv(). Unlike g_spawn_sync(), the %G_SPAWN_SEARCH_PATH flag
614 * is enabled. Note that %G_SPAWN_SEARCH_PATH can have security
615 * implications, so consider using g_spawn_sync() directly if
616 * appropriate. Possible errors are those from g_spawn_sync() and those
617 * from g_shell_parse_argv().
619 * If @exit_status is non-%NULL, the exit status of the child is stored there as
620 * it would be returned by waitpid(); standard UNIX macros such as WIFEXITED()
621 * and WEXITSTATUS() must be used to evaluate the exit status.
623 * On Windows, please note the implications of g_shell_parse_argv()
624 * parsing @command_line. Parsing is done according to Unix shell rules, not
625 * Windows command interpreter rules.
626 * Space is a separator, and backslashes are
627 * special. Thus you cannot simply pass a @command_line containing
628 * canonical Windows paths, like "c:\\program files\\app\\app.exe", as
629 * the backslashes will be eaten, and the space will act as a
630 * separator. You need to enclose such paths with single quotes, like
631 * "'c:\\program files\\app\\app.exe' 'e:\\folder\\argument.txt'".
633 * Return value: %TRUE on success, %FALSE if an error was set
636 g_spawn_command_line_sync (const gchar *command_line,
637 gchar **standard_output,
638 gchar **standard_error,
645 g_return_val_if_fail (command_line != NULL, FALSE);
647 if (!g_shell_parse_argv (command_line,
652 retval = g_spawn_sync (NULL,
668 * g_spawn_command_line_async:
669 * @command_line: a command line
670 * @error: return location for errors
672 * A simple version of g_spawn_async() that parses a command line with
673 * g_shell_parse_argv() and passes it to g_spawn_async(). Runs a
674 * command line in the background. Unlike g_spawn_async(), the
675 * %G_SPAWN_SEARCH_PATH flag is enabled, other flags are not. Note
676 * that %G_SPAWN_SEARCH_PATH can have security implications, so
677 * consider using g_spawn_async() directly if appropriate. Possible
678 * errors are those from g_shell_parse_argv() and g_spawn_async().
680 * The same concerns on Windows apply as for g_spawn_command_line_sync().
682 * Return value: %TRUE on success, %FALSE if error is set.
685 g_spawn_command_line_async (const gchar *command_line,
691 g_return_val_if_fail (command_line != NULL, FALSE);
693 if (!g_shell_parse_argv (command_line,
698 retval = g_spawn_async (NULL,
712 exec_err_to_g_error (gint en)
718 return G_SPAWN_ERROR_ACCES;
724 return G_SPAWN_ERROR_PERM;
730 return G_SPAWN_ERROR_2BIG;
736 return G_SPAWN_ERROR_NOEXEC;
742 return G_SPAWN_ERROR_NAMETOOLONG;
748 return G_SPAWN_ERROR_NOENT;
754 return G_SPAWN_ERROR_NOMEM;
760 return G_SPAWN_ERROR_NOTDIR;
766 return G_SPAWN_ERROR_LOOP;
772 return G_SPAWN_ERROR_TXTBUSY;
778 return G_SPAWN_ERROR_IO;
784 return G_SPAWN_ERROR_NFILE;
790 return G_SPAWN_ERROR_MFILE;
796 return G_SPAWN_ERROR_INVAL;
802 return G_SPAWN_ERROR_ISDIR;
808 return G_SPAWN_ERROR_LIBBAD;
813 return G_SPAWN_ERROR_FAILED;
819 write_all (gint fd, gconstpointer vbuf, gsize to_write)
821 gchar *buf = (gchar *) vbuf;
825 gssize count = write (fd, buf, to_write);
842 write_err_and_exit (gint fd, gint msg)
846 write_all (fd, &msg, sizeof(msg));
847 write_all (fd, &en, sizeof(en));
853 set_cloexec (gint fd)
855 fcntl (fd, F_SETFD, FD_CLOEXEC);
859 sane_dup2 (gint fd1, gint fd2)
864 ret = dup2 (fd1, fd2);
865 if (ret < 0 && errno == EINTR)
880 do_exec (gint child_err_report_fd,
884 const gchar *working_directory,
887 gboolean close_descriptors,
888 gboolean search_path,
889 gboolean stdout_to_null,
890 gboolean stderr_to_null,
891 gboolean child_inherits_stdin,
892 gboolean file_and_argv_zero,
893 GSpawnChildSetupFunc child_setup,
896 if (working_directory && chdir (working_directory) < 0)
897 write_err_and_exit (child_err_report_fd,
900 /* Close all file descriptors but stdin stdout and stderr as
901 * soon as we exec. Note that this includes
902 * child_err_report_fd, which keeps the parent from blocking
903 * forever on the other end of that pipe.
905 if (close_descriptors)
910 open_max = sysconf (_SC_OPEN_MAX);
911 for (i = 3; i < open_max; i++)
916 /* We need to do child_err_report_fd anyway */
917 set_cloexec (child_err_report_fd);
920 /* Redirect pipes as required */
924 /* dup2 can't actually fail here I don't think */
926 if (sane_dup2 (stdin_fd, 0) < 0)
927 write_err_and_exit (child_err_report_fd,
930 /* ignore this if it doesn't work */
931 close_and_invalidate (&stdin_fd);
933 else if (!child_inherits_stdin)
935 /* Keep process from blocking on a read of stdin */
936 gint read_null = open ("/dev/null", O_RDONLY);
937 sane_dup2 (read_null, 0);
938 close_and_invalidate (&read_null);
943 /* dup2 can't actually fail here I don't think */
945 if (sane_dup2 (stdout_fd, 1) < 0)
946 write_err_and_exit (child_err_report_fd,
949 /* ignore this if it doesn't work */
950 close_and_invalidate (&stdout_fd);
952 else if (stdout_to_null)
954 gint write_null = open ("/dev/null", O_WRONLY);
955 sane_dup2 (write_null, 1);
956 close_and_invalidate (&write_null);
961 /* dup2 can't actually fail here I don't think */
963 if (sane_dup2 (stderr_fd, 2) < 0)
964 write_err_and_exit (child_err_report_fd,
967 /* ignore this if it doesn't work */
968 close_and_invalidate (&stderr_fd);
970 else if (stderr_to_null)
972 gint write_null = open ("/dev/null", O_WRONLY);
973 sane_dup2 (write_null, 2);
974 close_and_invalidate (&write_null);
977 /* Call user function just before we exec */
980 (* child_setup) (user_data);
984 file_and_argv_zero ? argv + 1 : argv,
988 write_err_and_exit (child_err_report_fd,
1005 if (bytes >= sizeof(gint)*2)
1006 break; /* give up, who knows what happened, should not be
1012 ((gchar*)buf) + bytes,
1013 sizeof(gint) * n_ints_in_buf - bytes);
1014 if (chunk < 0 && errno == EINTR)
1019 /* Some weird shit happened, bail out */
1023 G_SPAWN_ERROR_FAILED,
1024 _("Failed to read from child pipe (%s)"),
1025 g_strerror (errno));
1029 else if (chunk == 0)
1031 else /* chunk > 0 */
1035 *n_ints_read = (gint)(bytes / sizeof(gint));
1041 fork_exec_with_pipes (gboolean intermediate_child,
1042 const gchar *working_directory,
1045 gboolean close_descriptors,
1046 gboolean search_path,
1047 gboolean stdout_to_null,
1048 gboolean stderr_to_null,
1049 gboolean child_inherits_stdin,
1050 gboolean file_and_argv_zero,
1051 GSpawnChildSetupFunc child_setup,
1054 gint *standard_input,
1055 gint *standard_output,
1056 gint *standard_error,
1060 gint stdin_pipe[2] = { -1, -1 };
1061 gint stdout_pipe[2] = { -1, -1 };
1062 gint stderr_pipe[2] = { -1, -1 };
1063 gint child_err_report_pipe[2] = { -1, -1 };
1064 gint child_pid_report_pipe[2] = { -1, -1 };
1067 if (!make_pipe (child_err_report_pipe, error))
1070 if (intermediate_child && !make_pipe (child_pid_report_pipe, error))
1071 goto cleanup_and_fail;
1073 if (standard_input && !make_pipe (stdin_pipe, error))
1074 goto cleanup_and_fail;
1076 if (standard_output && !make_pipe (stdout_pipe, error))
1077 goto cleanup_and_fail;
1079 if (standard_error && !make_pipe (stderr_pipe, error))
1080 goto cleanup_and_fail;
1089 _("Failed to fork (%s)"),
1090 g_strerror (errno));
1092 goto cleanup_and_fail;
1096 /* Immediate child. This may or may not be the child that
1097 * actually execs the new process.
1100 /* Be sure we crash if the parent exits
1101 * and we write to the err_report_pipe
1103 signal (SIGPIPE, SIG_DFL);
1105 /* Close the parent's end of the pipes;
1106 * not needed in the close_descriptors case,
1109 close_and_invalidate (&child_err_report_pipe[0]);
1110 close_and_invalidate (&child_pid_report_pipe[0]);
1111 close_and_invalidate (&stdin_pipe[1]);
1112 close_and_invalidate (&stdout_pipe[0]);
1113 close_and_invalidate (&stderr_pipe[0]);
1115 if (intermediate_child)
1117 /* We need to fork an intermediate child that launches the
1118 * final child. The purpose of the intermediate child
1119 * is to exit, so we can waitpid() it immediately.
1120 * Then the grandchild will not become a zombie.
1122 GPid grandchild_pid;
1124 grandchild_pid = fork ();
1126 if (grandchild_pid < 0)
1128 /* report -1 as child PID */
1129 write_all (child_pid_report_pipe[1], &grandchild_pid,
1130 sizeof(grandchild_pid));
1132 write_err_and_exit (child_err_report_pipe[1],
1135 else if (grandchild_pid == 0)
1137 do_exec (child_err_report_pipe[1],
1148 child_inherits_stdin,
1155 write_all (child_pid_report_pipe[1], &grandchild_pid, sizeof(grandchild_pid));
1156 close_and_invalidate (&child_pid_report_pipe[1]);
1163 /* Just run the child.
1166 do_exec (child_err_report_pipe[1],
1177 child_inherits_stdin,
1190 /* Close the uncared-about ends of the pipes */
1191 close_and_invalidate (&child_err_report_pipe[1]);
1192 close_and_invalidate (&child_pid_report_pipe[1]);
1193 close_and_invalidate (&stdin_pipe[0]);
1194 close_and_invalidate (&stdout_pipe[1]);
1195 close_and_invalidate (&stderr_pipe[1]);
1197 /* If we had an intermediate child, reap it */
1198 if (intermediate_child)
1201 if (waitpid (pid, &status, 0) < 0)
1205 else if (errno == ECHILD)
1206 ; /* do nothing, child already reaped */
1208 g_warning ("waitpid() should not fail in "
1209 "'fork_exec_with_pipes'");
1214 if (!read_ints (child_err_report_pipe[0],
1217 goto cleanup_and_fail;
1221 /* Error from the child. */
1225 case CHILD_CHDIR_FAILED:
1228 G_SPAWN_ERROR_CHDIR,
1229 _("Failed to change to directory '%s' (%s)"),
1231 g_strerror (buf[1]));
1235 case CHILD_EXEC_FAILED:
1238 exec_err_to_g_error (buf[1]),
1239 _("Failed to execute child process \"%s\" (%s)"),
1241 g_strerror (buf[1]));
1245 case CHILD_DUP2_FAILED:
1248 G_SPAWN_ERROR_FAILED,
1249 _("Failed to redirect output or input of child process (%s)"),
1250 g_strerror (buf[1]));
1254 case CHILD_FORK_FAILED:
1258 _("Failed to fork child process (%s)"),
1259 g_strerror (buf[1]));
1265 G_SPAWN_ERROR_FAILED,
1266 _("Unknown error executing child process \"%s\""),
1271 goto cleanup_and_fail;
1274 /* Get child pid from intermediate child pipe. */
1275 if (intermediate_child)
1279 if (!read_ints (child_pid_report_pipe[0],
1280 buf, 1, &n_ints, error))
1281 goto cleanup_and_fail;
1287 G_SPAWN_ERROR_FAILED,
1288 _("Failed to read enough data from child pid pipe (%s)"),
1289 g_strerror (errno));
1290 goto cleanup_and_fail;
1294 /* we have the child pid */
1299 /* Success against all odds! return the information */
1300 close_and_invalidate (&child_err_report_pipe[0]);
1301 close_and_invalidate (&child_pid_report_pipe[0]);
1307 *standard_input = stdin_pipe[1];
1308 if (standard_output)
1309 *standard_output = stdout_pipe[0];
1311 *standard_error = stderr_pipe[0];
1318 /* There was an error from the Child, reap the child to avoid it being
1325 if (waitpid (pid, NULL, 0) < 0)
1329 else if (errno == ECHILD)
1330 ; /* do nothing, child already reaped */
1332 g_warning ("waitpid() should not fail in "
1333 "'fork_exec_with_pipes'");
1337 close_and_invalidate (&child_err_report_pipe[0]);
1338 close_and_invalidate (&child_err_report_pipe[1]);
1339 close_and_invalidate (&child_pid_report_pipe[0]);
1340 close_and_invalidate (&child_pid_report_pipe[1]);
1341 close_and_invalidate (&stdin_pipe[0]);
1342 close_and_invalidate (&stdin_pipe[1]);
1343 close_and_invalidate (&stdout_pipe[0]);
1344 close_and_invalidate (&stdout_pipe[1]);
1345 close_and_invalidate (&stderr_pipe[0]);
1346 close_and_invalidate (&stderr_pipe[1]);
1352 make_pipe (gint p[2],
1359 G_SPAWN_ERROR_FAILED,
1360 _("Failed to create pipe for communicating with child process (%s)"),
1361 g_strerror (errno));
1368 /* Based on execvp from GNU C Library */
1371 script_execute (const gchar *file,
1374 gboolean search_path)
1376 /* Count the arguments. */
1381 /* Construct an argument list for the shell. */
1385 new_argv = g_new0 (gchar*, argc + 2); /* /bin/sh and NULL */
1387 new_argv[0] = (char *) "/bin/sh";
1388 new_argv[1] = (char *) file;
1391 new_argv[argc + 1] = argv[argc];
1395 /* Execute the shell. */
1397 execve (new_argv[0], new_argv, envp);
1399 execv (new_argv[0], new_argv);
1406 my_strchrnul (const gchar *str, gchar c)
1408 gchar *p = (gchar*) str;
1409 while (*p && (*p != c))
1416 g_execute (const gchar *file,
1419 gboolean search_path)
1423 /* We check the simple case first. */
1428 if (!search_path || strchr (file, '/') != NULL)
1430 /* Don't search when it contains a slash. */
1432 execve (file, argv, envp);
1436 if (errno == ENOEXEC)
1437 script_execute (file, argv, envp, FALSE);
1441 gboolean got_eacces = 0;
1442 const gchar *path, *p;
1443 gchar *name, *freeme;
1447 path = g_getenv ("PATH");
1450 /* There is no `PATH' in the environment. The default
1451 * search path in libc is the current directory followed by
1452 * the path `confstr' returns for `_CS_PATH'.
1455 /* In GLib we put . last, for security, and don't use the
1456 * unportable confstr(); UNIX98 does not actually specify
1457 * what to search if PATH is unset. POSIX may, dunno.
1460 path = "/bin:/usr/bin:.";
1463 len = strlen (file) + 1;
1464 pathlen = strlen (path);
1465 freeme = name = g_malloc (pathlen + len + 1);
1467 /* Copy the file name at the top, including '\0' */
1468 memcpy (name + pathlen + 1, file, len);
1469 name = name + pathlen;
1470 /* And add the slash before the filename */
1479 p = my_strchrnul (path, ':');
1482 /* Two adjacent colons, or a colon at the beginning or the end
1483 * of `PATH' means to search the current directory.
1487 startp = memcpy (name - (p - path), path, p - path);
1489 /* Try to execute this name. If it works, execv will not return. */
1491 execve (startp, argv, envp);
1493 execv (startp, argv);
1495 if (errno == ENOEXEC)
1496 script_execute (startp, argv, envp, search_path);
1501 /* Record the we got a `Permission denied' error. If we end
1502 * up finding no executable we can use, we want to diagnose
1503 * that we did find one but were denied access.
1516 /* Those errors indicate the file is missing or not executable
1517 * by us, in which case we want to just try the next path
1523 /* Some other error means we found an executable file, but
1524 * something went wrong executing it; return the error to our
1531 while (*p++ != '\0');
1533 /* We tried every element and none of them worked. */
1535 /* At least one failure was due to permissions, so report that
1543 /* Return the error from the last attempt (probably ENOENT). */
1548 * g_spawn_close_pid:
1549 * @pid: The process identifier to close
1551 * On some platforms, notably WIN32, the #GPid type represents a resource
1552 * which must be closed to prevent resource leaking. g_spawn_close_pid()
1553 * is provided for this purpose. It should be used on all platforms, even
1554 * though it doesn't do anything under UNIX.
1557 g_spawn_close_pid (GPid pid)
1561 #define __G_SPAWN_C__
1562 #include "galiasdef.c"